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                  <h4>getGRD</h4>Compute horizontal gradient of a geographical field
                  <br><small>Last modified: 20-Oct-2009 12:12:47</small>

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                  <a href="http://guillaumemaze.googlecode.com/svn/trunk/matlab/codes/geophysic/getGRD.m">Download here</a>
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                  <br>% getGRD Compute horizontal gradient of a geographical field<br>%<br>% [dCdx dCdy] = getGRD(C,LAT,LON,[flag,grid])<br>%<br>% Compute horizontal gradient of a geographical field C(LAT,LON)<br>%<br>% OPTIONS:<br>%<br>% flag = 0: lat,lon are normal axis coordinates<br>% flag = 1: lat,lon specify the spacing between coordinates<br>%           ie,  length(LAT) = size(C,1) - 1<br>%           and, length(LON) = size(C,2) - 1<br>% grid = 0: if output fields are on the computation grid<br>% grid = 1: if output fields are moved backed on the input grid<br>%              (edges are filled with NaN)<br>% <br>% Created 2007/07/01<br>% Rev. by Guillaume Maze on 2009-10-19: Change grid distance computation routine from "lldist" to my "lldist"<br>%<br>% All rights reserved.
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                  Last update: 2011 March 04, 17:46<br>
                  Created by Guillaume Maze<br>
                  More informations at: <a href="http://codes.guillaumemaze.org/matlab">codes.guillaumemaze.org/matlab</a><br>
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